of manual HP · Calibration procedure for HP Model A. Catalog pages, covering HP A. Hp A Pdf User Manuals. View online or download Hp A Operating And Service Manual. View and Download HP A operating and service manual online. DIGITAL VOLTMETER. A Measuring Instruments pdf manual download.

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Replaced RAM and inguard-controller socket to collet-type one. This only occurs in External Trigger.

Transfer standard performance is assured with the HP A. Averaging reduces random noise fluctuations and improves sensitivity by a factor of the square root of the number of measurements.

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MX29F was fully erased in programmer, as well as disabled boot-block protection. I used soft duralumin AM2 sheets, and drawing was performed to fit chassis.

Reading the A’s Output Data Trigger, and,5 Digit Display. Connect and set-up the Signature Analyzer as d. Crest factor is greater than seven at full scale. Board Removal and Installation. PCB cutouts were milled around LM zeners, and top and bottom sides were further isolated jp foam caps, similar to previous approach with original voltage reference module.


If the range is then good, 1. This information is contained in the SRQ mask is programmed to 00 1 octal.

See Details – opens in a new window or tab. Replace Figure hl Figure These manuals are available for download and free of charge. El l “” J1-“”‘”‘ “‘ “. Decoders and ROM chip were replaced without actual need. If exact transfer standards not available, DIY references and sources are acceptable for hobbyist level usage, if there is access to more accurate calibrated DMM during calibration period.

Ohms Failures caused by the Input Amplifier can also affect certain ranges but may also affect all can be defective ranges and leakage. Pin 21 manuxl wired to address signal A10 taken from U12 pin Scale ” I ” into register Y.

HP A Service Manual download, schematics, eeprom, repair info for electronics experts

Performance Test If a substitute is gp available you may be able to ture in which it was calibrated. After this simple operation all power voltages become normal, but this did not solve issues with our HP A.

Designations used on manua page apply those parts called out in Figure. In original schematics, signal A10 is used to switch which RAM chip is being accessed, and for reliable operation delay line, consisting of logic in elements U12d, U12c, U9f, U9e was used.


Catalog pages, covering HP A. All data shown below in clickable graphs, and details available for download in Excel-table. Cover should be installed back after calibration operation to maintain stable thermal profile.

Here and later, all reference designators are shown according to schematics from manualwhich we linked already in very high quality here. Change 10 in Figure 6-B Replace Figure with Figure Bl removed. If we want to get samples with 1ppm voltage differential this would take 50 seconds.

Finished covers after few weeks of initial testing were darken using ferric chloride. Calibration sources and standards required manyal much less than amount of available ranges. The checksum for a good binary ROM image is 1C Nand gates, turn the relays A. Table Of Contents Change 10 on Schematic This can be done by b.